DE1550342A1 - Automatic control device for the distribution of pressurized fluid from one fluid source to two hydraulic systems - Google Patents

Description

DlpL-Ing. H. ZOEPKE · * «." * "

Patent attorney - 155Ö342

Munich 5, Erhardtsiraße U

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Automatic control device aur voroilung ron Druekflüoaigkeit von Eiftcr FXüeei ^ keiteauolle on two Hydyatttlikeygteme _x

The invention relates to an oil bed-operated control unit for the distribution of pressurized fluid from a fluid source to a number of hydraulic systems, one of which has priority over the other depending on the position of the slider Kolbene a Sinlau with the Plüasigkeitsquelle and "inen first, a constant Flüseigkeiteverbindung aufreohterhaltende Droeeeltfffnung having outlet ait the primary Hvdraulikayetea eovie a second AuelaO with the other 3yetee in connection au bring iet" Such Stawereinriohtiangen "Ina for Hydraulikeyeteae suitable ₉ where as "priority Sy" tea Lenkhilfα a hydraulic system and the sveite a) hydraulic working machine "such as B _0" of a lifting device of a vehicle, for example, a flask equipped with towing Einir Frontladoeinriohtung he are assigned o

Here it must be ensured that * & J & g J & * ^ ³ J * g ¹¹ « ^be ~ BATH ORIGINAL

the steering system acted as the pressure of the hydraulic fluid carried by this "" remained essentially constant

The control device referred to as a $ anffe is, inter alia a pre-soling from the Aneelderin (DP 1 211 881) «With this before · The bottom control device is used to control the printing ■ medium su a -priority steering device and a near-range lifting device by a 0 * derloeen, as a stepped piston designed slide piston · If the upper piston closes the outlet belonging to the steering device, it still remains through the throttle opening old of the steering device in liquid * - rerblndungo From the steering device the inflowing liquid can stray into the liquid tank

Mainly in industrial and agricultural vehicles are Such an open central hydraulic system is used in front of those who have one delivering a constant flow rate when the Fahrseugee is in operation Have Putspe, of which the required flow of liquid bypassing the asu controlling Hydranlikeinrichiungon in the Liquid tank is piped when these facilities Liquid Ycrlangen.

*? On the other hand, aan has recently passed over "the aforementioned α, vehicles eithloseanen Zentralhydraulikeystetaon atutssurüaten «

ο This sy et tee "which only has significant advantages over it",

° usually have a pump whose delivery rate can be changed ", ^ which only promotes hydraulic fluid when sua at least from elnaai der hydraulic working group «Druokuittel is required» for this

BATH ORIGINAL

Syeteae is also characteristic that the Druokmitteletroin is shut off the one of its working circuits _B when no pressure medium is required from the respective Hvdraullkelrichtung essential advantages of the above-described hydraulic systems consist η ·· «in the fact that not only because of the Puape, which is only conveyed when necessary, the necessary external drive Forces are kept small, but even higher fluid pressures can be used for smaller components. The possibility is also created to use a piston pump to counteract the action

which have been used up to now and provide a constant amount of liquid Gear pumps have an "eeentllch higher efficiency"

The invention is based on the object of creating an automatic control device of the type mentioned at the outset which, with a simple structure and cost-saving manufacture, also with fluctuations in pressure and vibrations in the pressure medium ia hydraulics *? ensures en st, dad in particular in a closed Zentralhydrauliksystesi if necessary, the primary Hydrauliksyatecs always sueret Aiit pressure medium is supplied ₀ This is erfindungsgemäS achieved ι that the two Hydrauliksyeteme in Kittelstelltsng becitzen a locked passage having valves located βloh through the actuation of the Sehleberkolben due to the at its two ends dividing differential pressure within the longitudinal bore aue a first end position held by a Dedcr in its other Xnds division or in Zvi ε even slopes so automatically shifts that below a certain pressure = aittelstroaes for the priority hydraulic system dae subordinate

Hydraulic sysrfeee automatieoh geeohloes4) not _o

0098 30/0296

BATH ORIGINAL

Advantageously, the spool has no end inside a control chamber connected to the inlet and the first floodplain and old at its other end within a control chamber connected only to the "inlet"

The connection between the control chamber and the first is expedient Au · lau and the inlet via a valve provided in the piston Radial bore and an "axial bore" arranged in the associated piston end and receiving the Fe <ier during the connection of the other control chamber with the inlet one of the latter on the flow direction of the pressure medium diagonally near the rear branching channel provided let ο

An embodiment example of the invention is shown in the drawings * and described in more detail below

Figure 1 shows the new control device in a closed Zentralhydraulikeyetem with a priority and close-range hydraulic circuit with a valve piston located in its one end division, _r

FIG. 2 the control device with valve piston located in a Zvisoheneteilliohem ₍

_o Figure 3 the control device with in the other end position *

to located spool,

<*> Figure k a part clip through which the valve piston opens.

^ increasing length bore of the control device in

_β largest scale.

The closed Zontralhydrauliksystem inclined in Figure 1 has

a designed as a Hengentoiler control device 10, which has a

BATH ORIGINAL

Point % k ait dea liquid tank 12 let it stand. The delivery rate of the motor-driven Puape i4 let can be changed. Since the primary hydraulic system 16, which is a steering system according to the present embodiment, is in a directional control valve 18 with a closed central position and a reversible hydraulic motor 20 in the form of a double-acting hydraulic cylinder, in which a piston 22 connected to the parts to be steered based on the wheels of a vehicle is reversible stored istο the second or subordinated hydraulic system 2k is formed as a lifting device with a closed center · Bs should be mentioned here, "that the Hilfakrelslauf may comprise a plurality of independent Syeteme asur actuating various hydraulic facilities * and can awar _v as the pump ih old TevBorgen as many pressure fluid."

The control unit 10 has a housing 26 of a length hole is old stored verschieblieh on the sin spool 30 * In Oehüuse 26 1st an old dor pump Ife connected inlet 32 provided ,, the old via inlet passages 3k and 36 of Läcgsbohrung 28 communicates ο Dl "Längsbohrune 28 1st at one ΈηΑ% old Onea first Auslad 37 door, the primary hydraulic system Λ6 and ihrea other end old one aweiten outlet 38 connected to the naohrangige hydraulic system 2k the" far · outlet 38 has Bwei flow channels ko and kZ, the au both side of the inlet channel 36 are Aa · Ände front of the inlet channel 3k * kk is provided a Drossflblende "a DurehfluilbegrenBung awlsenen JZ the inlet and the channel ₉ forms 3k au ensure a constant flow in the inlet conduit 34 ,. The first at & eiaß

37 stands with a .safety valve hfy ^ nj β ^ Μ ^ Ψφ * which BAD ORlGlNAt

if a certain pressure in the hydraulic system is exceeded, it is connected to the liquid tank 12. The ends of the valve piston 30 are arranged within control chambers 52 and 5k . In the valve piston 30 associated with the control chamber 52 , an axial slide guide 58 is provided, within which a compression spring 56 is arranged, which normally presses the control slide 30 into a single position As shown in Figure 3 o At the opposite end of the master piston 30, this has a further axial bore Ton the lsterer facing control chamber 5h branches off a channel 60 into the inlet 32 "so that it is connected to the chamber 5 ^ in liquid" connection ₀ Dde other control chamber 52 communicates via the axial bore 58 "a branching off radial bore 62 and the ereten inlet passage 3k old inlet 32 in fluid-conducting communication ^ the pressure of the bE in the Steuerkasmier 5 * 1: 'ad * high liquid is as high as the liquid β pressure in the inlet 32 _o

The piston valve 30 has three mutually spaced apart control surfaces 66, 68 and 70 "alternatively which control grooves 72 and 7 ^ are located" 1 "In particular, FIGS. The above-mentioned radial opening 62 in the control slide 30 is provided on at least one flat 76 in order to establish a constant fluid connection with the inlet channel 3h and the control chamber 52 and independently of 4R

Position of the sole bar piston 30 within the lay bore 28

00983070296

' ⁷ " _D ORIGINAL.

In the control chamber 52 there is dl · pressure fluid therefore «ntοία · ■ same Sraok vi · in the inlet channel 3k»

"End · au at their exits the Oehäuse 26 is dl" length bore duroh a closure · stuff closed 80 · This plug be "sltat a Ansehlagteil 82 to the axial movement of the control slide 30 * naoh the" inen direction to limit ₀

The aforementioned "safety valve k6 has" as Figure 1 shows <* ■ • in Ventilstttok 81 "lt a passage opening 83, the bit is the first Auslad 37 & B connection o Furthermore belongs to the safety Tsntii k6 © in YereahluOstUok Sh, which is within a Bore 86 of the valve seat 81 is slidably supported within the bore 86, which is connected to the fluid tank IS, a spring 90 is arranged because the wear kit Sk presses against the valve seat 81 in order to move below a certain fluid level in the first Prevent the outlet 37 between the latter and the liquid tank 12 into the liquid fire binding

The longitudinal bore 28 of the Schleber Xolbsne 30 has control holes 91, 92, 9, 196 and 98. The control surface 92 is arranged between the first outlet 37 and the first inlet channel 34 and is provided with stepped Xanten 102, which accommodates the curses 78 of FIG Sohieberkolben "CON" rfl & ohe 68 adapted eindc in position dee spool 30 in ssiner leftmost Knd "\ selltmg _t as" shown in Figure 1, the liquid stream ~ is on the inlet channel century to the Sehieberkolbezt 30 around the first through the Torbesohriebene Anordneng Outlet 37 throttled »

009830/0296 ORIGINAL BATHROOM

"3 0 C5"

be β β he «η Vcretändnie of the invention" Now ei, the operation of de * new control device described ,, The FIG represented t · Puepe \ h can be "1" axial piston pump may be formed with the swash plate "wake changing its delivery rate, wherein by changing the angular position the swash plate the delivery rate can be changed "The swash plate can be controlled by a control valve that is not roped", The Pompe fceginqt to deliver when in the inlet 32 the Hüseißigkeitsdruok falls below a certain value , for example ikO kg / cm ² .

The spool, 30 is by its spring 5 ^ normally pressed against the stop 82 (Fig. 3), whereby the bin 32 also ate with the »primary and secondary hydraulic circuit in fluid interconnection etehto

The pump Sk is not dargaetellt by don Fahrseugnotor "the driven Main the engine is started ,, and the pressure in the system is below the predetermined Sye4eindrucke" is that Pumpentaumeleoheibe is moved from its neutral position "above the predetermined pressure within the priority Hydraulikkreislaufea the safety valve h6 responds «eo that the overpressure can be released o

ο It is assumed that both the priority and the ^ Subordinate Hydraixlikkreielauf are in neutral position «9 ο that

- ^ the flow of liquid is shut off »from the pump ih will

ro therefore does not require any liquid, so that within the «2in-

lascee JZ build a pressure kantt _c dos forward on reaching "certain value requires that the pump stops fSrdern" In

" ⁸ - ORIGINAL BATHROOM

this «« state presses di # Fed »? 56 d $ n valve spool 30 in β o ine in a right end position shown in Figure 3, in which there is a liquid connection between the first inlet channel 3k and the first outlet 37 and the second inlet channel 36 to the channel kZ of the second outlet 33

Now that the steering valve 18 of the priority hydraulic circuit is moved from its neutral position to a working position, pressure fluid can flow into the hydraulic cylinder 20. As a result, not only does the pressure drop in the first outlet 37 "but also in the entire hydraulic system, whereby a signal is given to the pump 14:" Promote BU "The drop in the first outlet 37 also causes a" corresponding "decrease in the fluid pressure" * within the control chamber 52 "which is connected to the first outlet 37 via the radial bore 62 ο on this Vois" is svisohen the two Steuevkataaern 52 land 5 ^ "in differenadmack" by the valve piston "30 to the left in di · in Zvluchon shown in FIG. 2 "position moved" in this position the flow to dome "wide outlet 38 is shut off" and "was as long as the pressure medium flow from the Ptacpe tk maintained a certain flow rate for the priority hydraulic circuit" As soon as this "Dtaroh" fIttßntenge for the priority bydraulikkrellauf from the pump % k is reached "the pressure in the control chamber 52 drops and the valve piston is turned to the left in a" new "between Immediately postponed, in which the "wide * outlet 38" came into contact with the inlet 32 and the control careaer 5 ", and thereby if necessary

To be able to supply Kilfskreittlauf Zk with pressure medium,

00 9 830/0296

BAD ORiüiNÄL

~ 10 -

Wi * mentioned ready "ensures the orifice 44 au for a constant Durohfluä of hydraulic fluid · dea first inlet channel 34 * u de" primary hydraulic circuit "while the radial bore 62 ensures in dea Sehleberkolben 30" that regardless of the position de "Schieberkolbeas the Drüke In Stousrkaaaer 52 and 1 «first AtielaO 37 the same height« and ₀ The lateral flattening 76 on the slide piston 30 «share in the fact that the flow rate to the primary circuit 16 remains constant and, for example, fluctuates independently of the sudden fluctuations in the flow rate in the Drttokl'aaer Pressure differences in the "priority and near-long hydraulic circuit eewle independent τοη changes in the durometer" flow Ib Klnlaß 32 · Also in the outer left end position do "single piston 30 allows the flattening 76 a constant flow of water is the same as the flow of water 44

If during the actuation you · Kydrosylindere 20 dee before »priority Hydracalikkrelaufee i6 » ine susätallche hydaullecho device in the Hjlfekreialauf Zl brought into working position «eo a jriüeigkeiteetrifanmg exeiiglioht, the priority is subordinated to the Hjlfekreialauf Zl DnMk in den linlafi 32 from "Assuming that the Durohf loaded la Invitation 32 is still above the flow rate required by the priority hydraulic" circuits ", a liquid is set up from the" wide Zraaufkunal 36 over the Sohieberauenehauxkg 74 south of the first Ab. '.aufkanal 40 of the "wide Auelaeses" made possible.

009830/0296

BATH ORIGINAL

- 11. -

If the steering valve 18 in circuit 16 is switched to the most neutral position, the pressure in the control chambers 52 and 5k is equal, so that the spring 56 is shifted around the slide piston 30 to its right-hand position, so that the ennobled inlet channel is wiped 35 and the fight flow channel KST a liquid connection is established vährend dl "Flüsaigkelteverbindung between the channel 36 and is he · ten Auslafikmttal ho abgeeohloeeen" As a result of calibration in Neutral "• teilvag befitsdl ion steering valves · takes place 18 at first outlet 37 is no B "Rehfl" ißo Mo liquid "connection of the first Auelaeeos 37 not with the first circulation channel 3 ^ remains, however,

Under the ^ simhmm _$ that pressurized liquid to the second Auslad 38 β tr tat and IE priority Ifydrattllkkreislauf required 16 DmxckflUseigkoit "keount to a pressure drop in the first outlet 37. Daduroh the Seraieberkolben 30 is aia ^ eablioklich after left in its ge in Figure 2 se igte Zvisehenateilimg moved; where he blocks the fluid connection between the incoming supply channel 36 and the third outlet 38 and gives the liquid outlet 37 when the liquid required by the priority network is dispensed and the pump 1 * 1 works at full capacity thus, check the spool 30 within represents the longitudinal bore 28 by slightly shifting from the position of Figure 2 NaOH left automatically CIn ₁₁ wherein between the avexbeiz Sinlaufkanal 33 and the AuslaOlcanal ko one FlUssigkeite ^ compound is prepared _o Sehieberkolben 30 provides calibration continuously within the bore through the occurring Difforenadrticka in the priority and subordinate cycle a _c lim βloharz that

a constant amount of liquid to the τ-orrangigcn Syctaia p-r -SW) ORiQINAL .ta «009830/0296

-. 12 «

and no overrides occur "and - as already mentioned the" flattening 76 "on the gate valve piston 30 and the droaeel diaphragm 4fc in the inlet channel 3 *" provided, when the pump ik conveys a liquid quantity which is the primary system The pressure above the aforementioned drop opening drops, as a result of which there is a corresponding change in the pressure difference that pushes the valve piston to the left Chamber *> 2 relatir holier iet «whereby the opening of the AuelaOkanal ho is enlarged

Been the vorbeeohrlebene new controller iet beeohriebon at din · "geeehloeeenen Zentralhydraulikeyetem · GrnndaätKlich is oe However mtfglioh" dieee control devices in an open Zentralhydraulikeyetem su benut »en ₀ Xn this case, the Torrangige and naohrangig · Hydraulikkrelelauf 16 and 2k are of course always open, eo that ik et from the pump and strength FlUeeigkeit we rerlangt therefore this continuously in action iet _e Xn this condition would the Sehleberkolben 30 barely into its right end division _r get out "taken at Beg & nn the Fumpentätigkeit and would in the event of Druokspltsen in the control chamber 520 the other hand, the spool 30 swlsehen his left Bndstellung and Zwiechenstellungcn rersohiebbar eein in which pressure fluid wirdo given priority xu the hydraulic circuit sixteenth

009830/0296

BAD ORiGINAL

Claims (1)

. H. ZOBPKE Patent attorney ^ « Munich 5, Erhardtstiaß 11/7 y J 31 485 m / 478 2. 3ep-b. 19öG Pa t entansprüche β Automatically "controller sur Verteiltang of pressure fluid from a fluid" source on two Hydraulikayateme _s of which relative to the other priority "best ·· has starting from a. Housing with one or two sswei end positions. versohieblioh mounted Sehieberkolbesi receiving length bore; Which depending on the position of the slide piston over the inlet old of the liquid source and over the first? a • täadlige FlUsaigkeitsverbindting upright preserving "Droseel- üffmang having outlet and the priority hydraulics" tea "owl · a" far outlet with dea other system in conjunction * u bring gekennseichnet characterized _c that the two Hydraulikoysiseae (i6 _p 24) with to Ie te llung having a blocked passage valve " (x _o B _a 18)" _o by external actuation the slide piston (30) as a result o- ■ ■ co of the differential pressure adjusting at both ends u) within the longitudinal bore (23) from a first »through a ^ Spring (56) held Bnd * tellung into its other Kndstellung Φ or in such Zvisohenetellungen automatically shifts that - ■ below a certain pressure medium flow for the pre- Hydre.iilik.yete » (i% **» _ö fä $ fa * nel _S · Hydraulik.ye, *. « (2k) is automatically completed o ο Control device according to claim i _t characterized in that the gate valve piston (30) old its one end within a control chamber (52) connected to the inlet (32) and the rated outlet (37) and old its other volume within one only the BinlaQ (32) connected control chamber (5 ¹ O is arranged * 3β control device according to claims 1 and 2, characterized gekennselehnet that the connection of the äteuerkatamer (52) with the first outlet (37) and the inlet (32) via a la slide piston (30) provided radial bore (62) and an in the associated Axial bore (58) located at the end of the piston and receiving the spring (56), while the other control chamber (5 * 0) is connected to the inlet (32) by a channel sloping backwards from the latter in the direction of flow of the pressure medium (o * 0) is provided ₀ H ₀ control device according to claims 1 to 3 »thereby knows that in the height of the radial bore (62) on the outer σ circumference de · Schleberkoloaa * (30) several lateral flattenings to / (76) are provided, which when the first outlet (37) is blocked Ui. - ^ the. en letitterem maintaining a fluid connection K) Form a droseel opening ₀ • 5 ο control device according Aneprueh k _t gekemaseichnet by te a ftieitea 2ulatifkanal (34) de »jjbaaseefc {&) * im 6AD ORIGINAL Orifice (4 ^) disposed let, i whose Average: römquerechnitt equal de * Durchatrttaquerechnitt the Dro "sclöffnur * g (76)" 6 · Control device according to one or more dor claims 1 t> ie 5t characterized gakenatseichnet that the L & ngebohrung (28) th between ere inlet channel (} k) de · Einlaetsea (32) and dam first AuelaO (37) "tufenftfrmie stepped shoulders ( 102) veiet » 7 «Control device according to one or more of claims 1 to 6, characterized in that a« further inlet duct (36) dee Sinlaeeee (32) with the corresponding position of the slide spool · (30) with a first or approaching discharge duct (ko or kZ) dee «wide Au · 1Aas ·· (38) to connect ieto Control device according to one or more of claims 1 bie? _t wherein 'that with dea first Auelaß (97) at a known calibrated safety valve (k6) in connection stehtt the parallel sua Sehieberkolben (30) within the GahKueee (26) ₀ BATH 00 9 830/0296